LXR linux/arch/mips/include/asm/stacktrace.h

   1#ifndef _ASM_STACKTRACE_H
   2#define _ASM_STACKTRACE_H
   3
   4#include <asm/ptrace.h>
   5
   6#ifdef CONFIG_KALLSYMS
   7extern int raw_show_trace;
   8extern unsigned long unwind_stack(struct task_struct *task, unsigned long *sp,
   9                                  unsigned long pc, unsigned long *ra);
  10extern unsigned long unwind_stack_by_address(unsigned long stack_page,
  11                                             unsigned long *sp,
  12                                             unsigned long pc,
  13                                             unsigned long *ra);
  14#else
  15#define raw_show_trace 1
  16static inline unsigned long unwind_stack(struct task_struct *task,
  17        unsigned long *sp, unsigned long pc, unsigned long *ra)
  18{
  19        return 0;
  20}
  21#endif
  22
  23static __always_inline void prepare_frametrace(struct pt_regs *regs)
  24{
  25#ifndef CONFIG_KALLSYMS
  26        /*
  27         * Remove any garbage that may be in regs (specially func
  28         * addresses) to avoid show_raw_backtrace() to report them
  29         */
  30        memset(regs, 0, sizeof(*regs));
  31#endif
  32        __asm__ __volatile__(
  33                ".set push\n\t"
  34                ".set noat\n\t"
  35#ifdef CONFIG_64BIT
  36                "1: dla $1, 1b\n\t"
  37                "sd $1, %0\n\t"
  38                "sd $29, %1\n\t"
  39                "sd $31, %2\n\t"
  40#else
  41                "1: la $1, 1b\n\t"
  42                "sw $1, %0\n\t"
  43                "sw $29, %1\n\t"
  44                "sw $31, %2\n\t"
  45#endif
  46                ".set pop\n\t"
  47                : "=m" (regs->cp0_epc),
  48                "=m" (regs->regs[29]), "=m" (regs->regs[31])
  49                : : "memory");
  50}
  51
  52#endif /* _ASM_STACKTRACE_H */
  53